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(Nd M0161. 3' Sheets-- Sheet 1.

T. s. WILKIN,

GANG SAW MILL FRAME.

- 110,291,255. Patented Jan. 1, 1884.

" Mum MM iwvzyzzga WITNEEE E5 N. 911535. Phutaulhngnplnr. Washington DvC.

3 Sheets-Sheet 2.'

'(No Model.)

T. S. WILKIN. GANG SAW MILL FRAME.

Patented Jan. 1, 1884.

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(No Model.) 3 Sheets-Sheet 3.

' T. S. WILKIN.

GANG SAW MILL-FRAME.

No. 291,255. Patented Jan. 1,1884.

Fig.5.

' I Fi 4 I I MAW-M 5 UNITE STATES PATENT O FICE.

GANG-SAW-MILL FRAME.

SPEGI FICA'IION forming part of Letters Patent No. 291,255, datedJanuary 1, 18E4.

Application filed November 15,1883. (No model.)

ToaZZ whom it may concern.-

Be it known that I, THEODORE S. WILKIN, of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented certain Improvements inSaw-Mill Frames, of which the following is a specification.

My invention relates to frames for gangsaw mills; and it consists in anovel construction of the same, whereby the strains due to the movementsof the sash are received and sustained in a straight line through thesides of the frame from top to bottom; and whereby, also, sufficientspread is secured at the foot or base of the frame to permit thefly-wheel to be'placed within the same between the pillowblock and sill.

The invention consists, further, in other details and features,hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a side elevation of myimproved frame; Fig. 2, a face view of the same; Fig. 3, an inside faceview of the lower section; Fig. at, a top plan view, and Fig.- 5 avertical central section of the same. I

Hitherto it has been customary to construct gang-saw-mill frames eitherof vertical timbers tied together by cross-timbers and braces or to makethem of iron side frames, either vertical from top to bottom or inclinedfrom the base to the carriage-floor line, and vertical from said line tothe top, Timber frames are clumsy, liable to become unsteadyand todecay, and are for other reasons objectionable, and hence iron framesare now almost universally used. Vertical frames are unsteady, be:causenot having sufficient spread to brace them; and the plan ofinclining the sides of the lower section and making the sides of theupper section vertical greatly weakens the frame at the floor-line andcauses the upper section of the frame to sway laterally when the gatemoves up and down, and fails to oppose the strength and stiffness of theside framesto the strains of the sash to the best advantage. Moreover,under all plans hitherto adopted the fiy-wheel has of necessity beenplaced outside of the frame, because there has not been sufficient roombetween the sill upon which the side of the frame rests and. thepillow-block in which the main shaft is carried to accommodate saidfly-wheel, nor suffi- -of basesection, a,

The base-section is formed with a forked upcient vertical space thereforwhen in its necessary position.

To give the utmost strength, stiffness, and steadiness to the frame, Iincline the sides from top to bottom in continuous straight lines, sothat whatever strains are put upon the frame through the movements ofthe sash are transmitted directly to the sills or bed upon which theframe is mounted without any tendency to rack or spring the frame. 13 ygiving the frame its ordinary width at top and spreading it from top tobottom I am enabled to get a considerable spread at the base withoutthrowing the sides materially out of perpendicular, and this spread issufficient to give room for the flywheel, as mentioned. Metal frames ofthis general character are usually made with each side in two partsoneabove the other-the line of division being at or about the line of thefloor on which the log-carriage travels.- Hitherto the lower or basesection has been made with a forked upper end and narrow horizontalbearing-faces, and the upper section has been formed with a dependingportion to enter between the forks at the upper end of the base-frame,and with narrow bearing-faces to rest upon those of the base-section. Inpractice such base-frames have generally been divided vertically throughthe mid dle to facilitate casting, and have been flanged and boltedtogether. Such construction is not sufficiently firmand unyielding towithstand properly the severe strains to which such frames areinevitably subjected; hence I construct my base and upper sections eachwith a bearing-face extending across its whole width from front to rear,offsetting thebearing-faces to pass the fork or opening, which isretained as a desirable feature of construction.

Referring again to the drawings, the above construction will be moreexplicitly set out.

A represents one of; the side frames as a whole, of which there are two,each consisting and an upper section, b.

per end, as shown,- but instead of making the forks entirely independentof each other, and leaving the space between them completely open, a ribor flange is carried across from one to the other, so as to form acontinuous horizontal bearing-face for the foot of the upper TOO sectionto rest upon. The flange or face 0 is cut away about one-half its widthacross the opening between the two forks of base-section a, to permit adepending portion, (7, of the upper section, b, to enter between saidforks, as shown. The upper section, I), also has a continuous face orflange, 0, from front to rear. Thus I am enabled not only to secure acontinuous and unbroken bearing or supporting face from front to rear ofeach side frame, but I also retain the depending portion of the uppersection and carry it between and bolt it to the base-section, asheretofore, thus getting a firm support and connection, and securing adegree of strength and rigidity equal to that of a continuouscasting,whieh it is difficult to make of the required size. This is ofgreat importance in gang-saw mills,which are required to withstandsevere strains, and must therefore be as rigid and unyielding aspossible. The side frames, A, are connected by a cap or head section, B,firmly bolted to each, and by suitable tie-rods or braces, C. These sideframes are made gradually narrower toward their upper ends, and arespread apart or separated more at the foot of the frame than at the top,the inclination of the sides being uniform from top to bottom, as shown,or, in other words, two straight-faced frames, A, are connected bysuitable ties or braces and have their upper ends placed a givendistance apart, and this distance is regularly increased from the top tothe foot. Parallel vertical bearingfaces f are formed on the inner facesof the side frames, A, near their upper ends, and like bearing orrubbing faces g are or may be formed at or about the line of thelog-carriage floor; or a single set of bearing faces may be made at anintermediate height to receive and support the face of the swingingguides in which the sash is carried. A continuous vertical bearing-facemay obviously be made on the inner faces of the side frames, but theplan indicated is preferred.

By spreading the frame from top to bottom and continuing the sides eachin a straight line above and below the log-carriage floor, the frame, asa whole, is perfectly braced against swaying laterally under the strainof the sash, and each side frame is caused to transmit the strains putupon it directly to the sill or foundation without lateral strain ortendency to bend or give at any point between the upper and lower ends.The great rigidity thus secured renders this frame very desirable, andovercomes the one objection hitherto found against metal frames. Anincidental but important result attained by this construction is thatthe fly-wheel D of the main driving-shaft E can now be placed betweenthe sill F, on

which the side frame, A, rests, and the pillow-block G, in which themain driving-shaft E is carried, still permitting the crank-wheel I tooccupy its required position, as shown in Fig. 2. This placing of thefly-wheel (which is independent of the crank-wheel or disk) within theframe, instead of outside, not only renders the apparatus more compact,thereby permitting a larger number of gangs to be set in a given space,but it also covers in and guards said wheel, so that it is less liableto be encountered by persons moving about the mill; and, finally, itbrings the fly-wheel close to the pillowbloek, in which the shaftrotates, thus materially adding to the steadiness and firmness ofsupport, and lessening vibration, and consequent wear and noise.

This improved frame has already proven its great superiority inpractice, and is rapidly being adopted to the exclusion of frames suchas I have mentioned as having been heretofore constructed. 7

Having thus described my invention, what I claim is- 1. A gang-saw frameconsisting of two side frames, A A. connected by cross-tics or braces,and having a regular and continuous spread from top to bottom,substantially as shown, whereby strains are transmitted directly to thesills and lateral strains are avoided.

2. In a saw-mill frame, a side frame consisting of base-section a,having recessed upper end and continuous flange or bearing-face c, andupper section, 0, formed with depending portion (1 and bearing face orflange c, said parts being bolted or fastened together, substantially asshown and described.

3. In combination with a gang-saw frame, composed of inclined sides A Aand cross'ties or braces, a driving-shaft having the crankpin of itscrank-wheel I exactly midway between the side frames, a pillow-block supporting the inner end of said shaft, sills supporting the sides A A, andfly-wheel D, mounted upon the shaft wit-11in the frame at a pointbetween the pillow-block and sill, as shown and described.

4. A gang-saw frame having its side frames spread farther apart at thebase than at the top, and extending in straight lines from top tobottom.

5. In a gang-saw-mill frame, side framcs,A, inclined outward from top tobottom, and provided with vertical bearing-faces on their inner sides,for the purpose explained.

THEODORE S. \VILKIN.

Witnesses:

VAL \V. ALLIs, THEODORE F. \VAMBOLD.

